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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e33439d86d9c7636ee39914070e7c701a13b34f66d0aa2fffa276447874356ec' 
  AND token = '6bY5DXlC/ztvyBE8t1wJL+oW6Bs1xYuf8Vin5L54BRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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