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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd98b8dbdc80dafd1dc14b9aed6b718e27563b15f14a2c50d12c95c9a36619d6' 
  AND token = 'Z+UxPDSruZNFR1U2UcDFzMZtRngTk4+Ydb6uD3h0UDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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