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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55bb3cc7aa8df442168a9dd27cfb5b77ff374daef92410dac0326ea893ea5acb' 
  AND token = 'Y+ktNu/LtEqyyx1+6+T2NzQmKlnZHtOMKci8WrO+/3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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