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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dcbe81fb3c0d53d603fb877484c32b7852715a9bea794694a5fa0335e9348874' 
  AND token = 'nXSKJvbXjLOHbNKN7hAFA82N1NDNELBFtahUd7VTgag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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