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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd252612b56e866d671c9a95c2f0639f96c8be285a06c0cf0f7965fbc3b80256b' 
  AND token = 'qDTqSAmmuq5/UCiO+uIwVjofWpatcKtxsrrQn3N4/LA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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