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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7336f06ee7defe7ceece2f3771c9168d4239709a3f5bf40b504e0012a4409637' 
  AND token = 'muvy6aKetdjCcFudVQMY1HvnUqpVT4V5eAkXPwy5pZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}