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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '500be2f09d34e331a1c6cfd9e4044d1a4b8691e30a86fb11d1ff6ffdc0f817ee' 
  AND token = '3s9yRiBrmZxIdEg9X6GPcNhmw2gSVGDpb3X0nLwg4dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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