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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cede82c679a58ebcc4c3de3e253216538c521b7a72e49be6c872debc569bafb0' 
  AND token = 'Fr1x2lZ1zlNHUMLsBfTsOul+GW6tQvx86Wqmx8rogXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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