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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19472415a92c688b0422d9028fd09061344392368d41069c101faa4924e3244f' 
  AND token = 'atmQL06ijwLXIcSOQgPVGapSJEgmbs5TRK+ypWcBEck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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