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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1314e0dcc40baaa1939ec39e2d874e449fafcd5921654f3a8ef505563f0118ca' 
  AND token = '9aAFcLvvmDN/dZvN5QRhkWXxzie3pGynU0dt9uRcVS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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