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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb9f8104bc60a010a80c7216f5ac45fd3d1658d8b20e5c5f4d3292523a087413' 
  AND token = 'iAA8H+n/eZ6YFg0olX7c2Vzfd1O7l2ncvl9L5GG0dGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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