SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9962bd6e3aed767104ad20630c8d76e6adf28f2b618e0661a1522a8f219825c2' 
  AND token = 'CZlGKBQhXkJd3pVEwwI6+G0q441YkwvHSXkSw2NSujY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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