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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56be06573b15bb90c6a0940429eed9f53ffe0fdc9187e115c89c1ba43986f69b' 
  AND token = 'z0lQh3ebkuqCFTuFNfZ4tZZDC5bPB6Kcd5Vr8nE0vCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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