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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c1eadab3194a15f5ec84d493d4a734016b91e487d0dbac6392ffda8e6c156d7' 
  AND token = 'E85H+ebSHJMSkyOz0kelHQ6agNLpmrRMzLg4dKwfZS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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