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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a370a7bf0cad2e5e4794bfa3960afac28c6f5913eacb8224b7c9104030603dc' 
  AND token = '+mB5EVvxf1CdXpeVm6v5M9710sXFOH+4C88gVloiVfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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