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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e78d197f56f166f80399383db30c7a2a7a168a126840af3e3bf1a53056dc97a' 
  AND token = '2fOIP43SIjdMWpInhfyc7hh15t1qxEpUqB+tWbUDTIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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