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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ebc68931c9146c6a33a9dd1f56d2612602e56fb55c740b06161c0010e4fb8b5f' 
  AND token = '+S3KFLef1SRNEAwWQTbPVvvfDxvKlBm3JWlhU+LtdSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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