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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2dec01ce3af3eb2fbdef3675508cae455fe228ff82e28635426b188ba91905ca' 
  AND token = '1lnm7R2E2gUoL3fNrlugderHeOIMvqGNEi/aoHQRpZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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