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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '713791efe8452df048465c1517f4120e29348310eb6b64154238576e2dbd45ec' 
  AND token = 'Bx3i2TtNqq3in18YV7fOVF8l/7vjSGPawXG9P4Tq0PM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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