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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cca5fe35f5a57d17b577ef8821d1619ae5e8b586beaa99d68354a264c5f9b704' 
  AND token = 'eyTaJg4/mkmxEhJr/WcP2PIv5qxQHyAyv2aX2/9tpOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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