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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '020e5cc7c3f9f965986ce8a19ea4bee31248ddeb9dd3d0f0280b7ed354e57456' 
  AND token = 'sLtbnBMm3uo3tt9Ad1dG2YP/IcGyGaIuBw0MnXNIW2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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