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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c17fb4a7eb23833664e625035c17850d488910753a83f65b7abf6f56cc8e2d2' 
  AND token = 'TW3t7orjhmIgD5vc6WTB338tEJvn3vH8ROFDAULd1/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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