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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90d7016ef0644012dd4011189e9f6a75f3706990f164bd6fc650c8700be948b3' 
  AND token = 'kB2ZBwDRysjBBeS84cpLn2E/XTjDQ7NoClSIXu+nlTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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