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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd438cdde8a981e3f69b4c679bd8aad400b278cafbe36cd01542409bb7a88878e' 
  AND token = 'caKM4P+RFrYxpH8DSIB3m31qsctCam6ONokQ0P6HJsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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