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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd971e10f084a08ed0d8967aeb0809d19a1ad5f21fc6634032ffac8824e2a669e' 
  AND token = 'fC7/vDnzFQnMDfaA8w3mLFrYbyq5PiFARv9F3uBkLZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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