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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a3ad5a5b00859506a02bd9d4298e951a569ccce5bba2e68cea87fc3c53ea92e' 
  AND token = 'ZagqsyLBQlNGUYVgZRvHAvWEEmZc7U4J0cxir38XQRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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