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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d5ce84da3aea96210b01afe0ec523be8960432b55d58329536e94a6ee349db6' 
  AND token = '4hRUT2TmxqY6YUUu0LJTzpIKNAuUMKhc/76kX1u2LGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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