SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b67e8daf44f3e2a93bc4f341db30a9bf65291257f2b69744c91fee9c59d027b1' 
  AND token = 'B59zfVBPJ1kDGq28I/qp7yCch3XzZdpkgbC2geDz7wA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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