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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3bb6089bb7824fcd12106f7f069e24735fcfe26a9a0217bc4b7f7e732c1b7bf3' 
  AND token = '4jlME1RcMuXuV2Rd+ox8ML/Z2jYQJI8ngjg9P+MUQ2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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