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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ee9c847d9d402cca201d416ec4ff61b9dd14fdf08e45830699eaf48dc0c80f7' 
  AND token = 'B2/ON2y5/d+zRnxC7XJrn9TV/djDa3S4jDqeZlp9DoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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