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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c00d48b6706d4b1880ad7d4a71558aeebf74494b9ec09f104d89ed62d0613bdc' 
  AND token = 'ZE3rbEu3PKp4Rl7QvjgvkRm3p9xuLKRwJKxwAdS+aDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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