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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98e273a644722359d74edf45b220413ba45c2f6d7cfb0cb0c8583b6bf4e7bfa8' 
  AND token = '3aofmnSZ/4I1ffHs+ECGtIwL1l1RRUP3SrkHsYdRt8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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