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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4fb40c236798d0f5902e0edc978e6927e4d485a340522863ebf3d77be992b701' 
  AND token = 'rDXPxNnJakiKK7NURL1ObV5QS6txyyYsoA9fi0iL/ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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