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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02c4060ba21fa49f5ef65942691fb2281549880497083d2c4c0a19822325cdc7' 
  AND token = 'Kp8FSn9hfHMusR3WKmX68eiLizgX2p2KYqI6TUC6dKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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