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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fccb50e5c67a0c6bea8de0dd6645c985d5f89ed9fe78cb82a10995f475ef5105' 
  AND token = 'JE+li7KyooZRO5slX3hU/lbBQSF9YKxD9IaLznYJciQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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