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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae402c6d244558a99044bc8dc53fb47612d8568e2a4abfcee8f01bbb682ff46d' 
  AND token = 'To2+FByBaoF/nocPhzJvVtq3ppVbKemfVNatZTcTLTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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