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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85a1c085b4c63eff6e33f4998b8e54ebae7fdd70bb20529b580c26cc5a076009' 
  AND token = 'h1nf/7NAKhOWi8jY7Kkq4RVeIfS9+D3jFXNK4txy3+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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