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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18c87164f3258a4260473882b138b9475251ed20132b92ea493de55858647153' 
  AND token = 'dHBBhrRNWIk9VinS0EUHVklZQUay9w7FcBofdO0CTAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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