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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9b716d7eadeaa4fea416f544bf471be7fbf12a37b51b1791df6323f05aa0422' 
  AND token = '7qIvl0zZkNPcMtynqMX06OaB/s3lSCbzZ5UCufajoIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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