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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '608308f8528f4449adc9359e7fa31e5e6040ebd661ef699dd532db0ca218796e' 
  AND token = '3FMhjZ46NWJZmYlS+/tT6t+Zwa2tAlEW73OALPNo8lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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