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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5167199d0ffb204e5160696b0c2abe7aa9b93b3832ebe10df5430e8efbe3c6a' 
  AND token = '7i0/fEHxzrD+YQpNCJUokPMugMHqvicobcQ/wW7PqQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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