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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '077f104c48ddb97b919aa4c62fdf18eaa7838a2e396154d6beb3c8d3514e6fe9' 
  AND token = 'ZZ98hF5iWK6x+cBrCbt+uPNhD0GWhR7QLO+QoOrNLDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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