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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d9dfbdf4e4e0576b9bb82f499e5cae93dac9f0df4db81612aa773b61a72973c' 
  AND token = 'lyzA03uT7GlQZKHNOqtX9eohdOie/hJPgyKWmTVy9Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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