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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44ffd4960ca9346c2929afc48166451ec2432e9109aa072e1edb4f94581189e8' 
  AND token = 'i3ZotYjPzU49jbRtjzapnZBYWEqVyN6vY6dc5wNV6IM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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