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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2cfa881c91963f884d5c7f8233aff30d24a85449979acaad04d8d99bbeb10ab' 
  AND token = '9SJe9mOxCpnUxG8pLVIj5XKPd0T9dI9yMeOQwX8McdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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