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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9fd29f95b49ed52d07c40459d2beb7a2e44ec698dead359e4ee514956fba67f' 
  AND token = 'M1GhAbUO97MPpKMKa+SXN9+M0GStAzxab34CmBdqEM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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