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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a89167c88a84558e31aa6afa4c3297359d558ad96e6ca9e35a323c5dd7f7536' 
  AND token = 'CaDrxnevgGWGJXgCWz1jgf6rgSm/oKthpJBN1qX5FTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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