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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b16cd4f1989147e3e019606cfed0bdbbbe83e44941cf1f9525e0df3782997e95' 
  AND token = 'JJB5xsZeJ2qwXfCaOC9UcKEaLgb7saUav1zMn0jb1iE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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