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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27face8a648aaed0476bd8977ca28bce07e7c31c2a654648808961a26df7285f' 
  AND token = 'Yluw2mEBbN6k+cphQolbes06um3IC33NS6CCDHt9k/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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