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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84c0872acb10a3ac23385bf961b330ec726defb875d1be349357e5afb7f77c15' 
  AND token = 'QujNAKiMm7WpGcZ2WvIZJOHUaqGr77HhlkgyM+yeAfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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