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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3b9ae89417670f5227c29494ac7138eca2d60cc2472fed4c5fb4892e7d45bb0' 
  AND token = '/JguUoX/cqvvf94blBoPcDMW4Stsj9lLa1hy32+0aMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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