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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55aba598f69695ceb143d20a475424cc09cdcc6d729d7dec9e087f059d73102a' 
  AND token = 'b2AvLOXhAM1/NYCA7c1FUVFtDRoHWUPv6YEkYnOIcAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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