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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a4ea79605d8f6d9ee8ebf8419728c50fccba5f0a4a065db3e7d0c32eee26f1d' 
  AND token = 'HoCw2XiZ552eyKzeFLMIh7Dle/W3+2waxuBJmkk7RZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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