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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87bf7ea657d9eacf75e283a66fcbd27f315cfb2accc2c887a92f9a3a337c473a' 
  AND token = '/T0unPdnZFyA0Hk5zOpMS3EDeVYPoIvZo3R10VnAX88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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