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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07e80dd1ec5bf04a2ff6c1602a1eaba309165c085538fa158e0fb1d68c8e6978' 
  AND token = 'p5ZkZk8fHpZOoR2jHj33h8sl4wAk6DkJSvpgHjYZ9c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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