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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de7183d89f58677592aed1e0f1ee539b2ede5f1ad5dd7ca5bb9ff445375c077d' 
  AND token = 'cSaXnhGh2jlpdW9aT+p7RKRMCKt9vcHCqFMUASVnGag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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